Letter envelope sheet



March 25, 193-0. I I M. s. YERKOVICH ,610

LETTER ENVELOPE SHEET Filed Dec. 14 1927 i I 1 E M /4/ i 73 I a f i g a l a 45 7 12 A j 4 Z Patented Mar. 25, 1930 MIRKO S. YERKOVICH, OF SAN FRANCISCO, CALIFORNIA LETTER ENVELOPE SHEET Application filed December 14, 1927. Serial No. 239,867.

This invention relates to a letter sheet envelope, and its object is to produce such an envelope with the minimum folding, and

with the minimum of pasted flaps for secur ing the envelope against tampering or inspection of the contents of the envelope.

It will be understood by those skilled in the art that many forms of envelopes have been used, and that with many such forms the letter can be examined by lifting open the envelope, and that a number of folds are used. In the present instance there is but a single fold with the letter proper, while if the letter is to be provided with an answer sheet it may be so arranged as to be folded twice, the answer sheet being torn off and sofrom the original.

Other objects of the invention will be apparent as the description proceeds.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout the several figures of the drawings and of'which there may be modifications.

Figure l is a plan view of the message and answer letter sheet, showing two securing tabs, intended to be used with a double fold,

Figure 2 is a view of the double folded letter as it appears when being sent the first 11; ime, the sealing tab being shown indotted mes,

Figure 3 is a plan view of the double folded letter as it appears when the answering message is sent, with the return flap sealed and shown. in dotted lines.

Figure 1 the letter sheet is rectangular, and V is provided with the folding lines 8 and 9 which extend diagonally across the letter sheet from its corners dividing it into four portions 10, 11, 12 and 13 all triangular in shape with the portions 11 and 13 having gummed tabs 14; and 15 to secure the letter sheet sealed. This letter sheet may then be folded oncealong the folding line '8 and then along the folding line 9 so as to bring it into the triangular form shown in Figure 2 in which event the gummed tab let is used to secure the letter edges together, thus leaving the gummed .tab 15 for future use. When the letter sheet is opened by cutting the tab 14 at its destination the sheet may be again sealed up by turning the portion 10 over the portion 13 thereby providing a place for securing the tab 15 to the outside of the letter to prevent it from being examined, and completely concealing the writing.

The letter M indicates the going'message, and A the answer in Figure 1. G in Figure 2 indicates the going-message folded, and R, in Figure 3 indicates the returning message.

Having thus described my invention, wha I desire to secure by Letters Patent of the United States is as follows, but modifications may be made in carrying out the invention as shown in the drawings and in the above particularly described form thereof, within the purview of the annexed claim.

A letter sheet having gummed flaps along two opposite sides, with diagonal folding lines intersecting at the center of said sheet impressed therein whereby the letter sheet maybe folded on one of said diagonal lines and then folded on the other and sealed by securing one of the gummed flaps to the other portions of the sheet.

In testimony whereof I have hereunto set my hand this 5th day of Dec., A. D. 1927.

v M. S. YERKOVICH.

In the form of the invention shown in 

